As a user I want to see which keys from a content schema (e.g. mab) are utilised in a mapping.
The current schema widget is able to display a structure schema (which is in some cases the content schema as well, e.g., for CSV files). However, having the structure schema only leads to the disadvantage, when one attribute path is utilised in many different mappings, e.g., as it is the case for mabxml, where usually nearly all mapping start from feld->value and a filter (/key definition) on feld->nr + feld->ind.
The content schema widget should overcome this disadvantage by displaying all utilised keys, e.g., 088a, with flows to their target attribute paths.
see also: Sankey Diagram (http://bost.ocks.org/mike/sankey/)
- the design proposal: https://avgl.mybalsamiq.com/mockups/1639293.png?key=27106ea66faf01c9ad98a275eac48683ac53bf00
- all utilised keys from a content schema are displayed with their flows to their target attribute paths.